how to erase certain characters in a string using a for loop

Answer 1

izillid

#include <algorithm>

str.erase(std::remove(str.begin(), str.end(), 'd'), str.end());

this the common erase

but as to a for loop

std::string mystrg;
mystrg.reserve(str.size());

// algorithms
for(size_t i = 0; i < str.size(); ++i)
if(str[i] != 'd') mystrg += str[i];